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  • 1
    Publication Date: 2018-09-23
    Description: In order to have a sustainable management on Persian sturgeon (Acipenser persicus) as a highly commercial species in the South Caspian Sea, we need to identify its population structure and the level as well as its conservation status in their natural habitat. To develop a conservation program for this all Caspian Sea' sturgeon species it requires knowledge of its genetic diversity using reliable molecular marker to study population genetic structure. For these purposes, an enriched library was prepared based on a modified biotin-capture method. Approximately 1800 positive clones were screened for microsatellites in an Acipenser persicus genomic library. Of these 350 positively hybridizing clones were sequenced, and 81 clones were identified as having microsatellites with adequate flanking regions. We developed and tested 68 microsatellite primer pairs for Persian sturgeon. Out of 68 primer pairs developed, 11 pairs resulted in poor or no amplification, 13 were ambiguous, 6 were monomorphic, 20 were tetrasomic and 18 were octosomic in Persian sturgeon. While none of the markers showed disomic inheritance in Persian sturgeon and Russian sturgeon (A. gueldenstaedtii). Several of the markers appeared useful for studies stellate sturgeon (A. stellatus), ship sturgeon (A.nudiventris) and beluga (Huso huso). Nearly all the polymorphic pattern for ship, stellate and beluga displayed the simple banding patterns characteristic of disomic loci, while those for Russian sturgeon displayed banding patterns characteristic of tetraploid or higher polyploid levels. These markers may prove useful in a variety of future sturgeon population genetic studies in the Caspian Sea.
    Keywords: Biology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
    Format: application/pdf
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  • 2
    Publication Date: 2018-10-13
    Description: Nowadays, Litopenaeus vannamei are the most important species of farmed penaeidae shrimp in the world that is rapidly replacing native species in areas aquaculture. Due to demand increase for this species culture, shrimp displacement to different areas may be associated with some potential pathogens transferred to new areas farmed. Therefore, in this study were prepared bi-osecurity conditions for specific disease-free production of L. vannamei. Thereafter, three populations (Molokaei, High health and mix of Molokaei and High health) of the shrimp various reserves were detected base on origin and genetic indexes such as: observed heterozygosity, expected heterozygosity, allele frequency, coefficient inbreeding, genetic differentiation, genetic distance and genetic identity. On the other hand, epidemiological studies indicate non pathogens (viral, bacterial, fungal and parasitic) recognition of different populations selected in the quarantine salon. The bioassay results showed that the average weight and length of the populations of High health and Mix significantly greater than was a population of Molokaei. The shrimp populations were stocked in fiberglass tank (five ton) and were kept separated in the quarantine salon. During maintenance shrimp of populations in the quarantine salon were evaluated living and non-living pathogens with PCR, microbiology and biochemical methods. There is not any pathogens detection from shrimp populations stocking in the quarantine salon, so the shrimps were carried over to pond for broodstock culture of specific pathogenic free.
    Keywords: Aquaculture ; Fisheries
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
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  • 3
    Publication Date: 2018-10-14
    Description: Caspian brown trout (Salmo trutta caspius) is an important from the point of economy. In this study genetic diversity of (Salmo trutta caspius) was investigated using microsatellite markers from two regions of the Iranian coastline of Southern Caspian Sea (Cheshmeh Kileh River in Mazandaran Province and Karganrud River in Gilan Province). The purpose of this research was the study of Salmo trutta caspius possible populations related to genetic diversity and population structure in the Caspian Sea and introducing the useful genetic markers. For this purpose the number 225 fishes from two Rivers were collected. DNA was extracted and amplified with 16 pairs of microsatellite primers using Polymerase Chain Reaction (PCR). The amplified products were loaded on polyacrylamide gels and bands were analyzed using Gene Alex and Pop Gene soft wares. Observed and expected heterozygosity averages were 0.46 ± 0.09 and 0.60 ± 0.10, respectively. According to the results from this study, Genetic polymorphism has been seen in this population.
    Keywords: Biology
    Repository Name: Aquatic Commons
    Type: Monograph or Serial Issue , NonPeerReviewed
    Format: application/pdf
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